Grinding and polishing machine



(No Model.)

W. B. PENN. GRINDING AND POLISHING MAGHINE.

No. 282,293. Patented Jilly 31. 1883.

N PETERS. Phuln-Lilh0gmpMn Wnhin mn. 04 c4 UNITED STATES PATENT OFFICE.

WILLIAM B. Fun N, OF MERIDEN, CONNECTICUT.

GRINDING AND POLISHING MACHINE.

SPECIFICATION forming part of Letters Patent No. 282,293, dated July 31, 1883.

Application filed May 7,1883.

ro all whom it may concern: I

Be it known that I, WM. 13. FENN, of Meriden, in the county of New Haven and State of Connecticut, have invented a new Improvement in Grinding and Polishing Machines; and I do hereby declare the following, when taken in connection with accompanying draw.- ings and the letters of reference marked there on, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent,

Figure 1, aside view; Fig. 2, an endview; Fig. 3, a view taken at the rear end of the machine, showing the end of the shaft S, the crankwheel h, and the connection whereby a rocking movement is imparted to the shaft, and also the arm near the forward end of the shaft which connects the said rock-shaft with the carriage C; Fig. 4, a vertical section through the segment-shaped slots in the boxes to show the manner of securing the boxes in the crosshead. w w

This invention relates to a machine forgrinding plane surfaces. r

In the usual construction of machines for grinding plane metal surfaces, at bed is arranged to move upon guides beneath a grinding-wheel. i The grinding-wheel is necessarily large, or the wearing away of the surface would necessarilyinterfere with the regular planegrinding. Alarge wheel which will perform this grinding most. satisfactorily is limited as to its velocity because of the danger of bursting the wheel. Again, a large diameter of wheel is many times inconvenient because of the impossibility' of closely examining the operation of the work, which might be done were the wheel small. Owing to this latter difficulty, small articles are ground by hand, i

the operator applying the article to the face of the grinding-wheel, using his judgment and skill to make perfect work.

The object of my invention is to secure a long grinding-surface equivalent to a wheel of large diameter, andyet operating as would a wheel (No model.)

the same as it would do were the roll itself the grinding-wheel. 1

A represents the bed of the machine, upon which the operative mechanism is placed, This bed is similar to the bed of common iron planers. On this bed is a platen, B, arranged to move longitudinally on guides a, substan tially as does the platen of an iron planer; and longitudinal movement may be imparted to that platen in the usual manner of applying such movement to the platen of an iron planer, too well known to require description in this specification.

The platen B is fitted with transverse guideways 12 at right angles to the guides at, and upon these transverse guides a carriage, G, is an ranged, this carriage being free for transverse movement upon the platen B, butmust move with that platen.

D D are two uprights similar to the uprights of an'iron planer and in the usual relationof such uprights to the planer. On these uprights is a cross-head, E, arrangedto be moved vertically up and down by means of a leadingscrew, F, or otherwise. From the cross head side pieces, F, extend down, each carrying a lug, d, above, and a corresponding lug, e, be low, each provided with its set-screw f. 7 Between these lugs bearings or boxes H are arranged, carrying a transverse shaft, I. l The boxes H are secured to the cross-head or side pieces by the bolts t. (See Fig. 4..) These bolts extend through slots V in the vertical side pieces, with the head of the bolt up on the back side, as seen in Fig. 4, the bolt extending through segment-shaped slots at in the boxes, and the nut on the outside of the boltsto clamp the boxes to the side pieces of the cross-head. The vertical slots V in the side pieces, as seen in broken lines, Fig. 2, permit the boxes to be adjusted up and down by means of set-screws f, it only being necessary to slacken the nuts on the bolts to permit such adjustment, and when adjusted the boxes are boundfirmly to i the side pieces by the nuts and bolts t. On the shaft I is a roll, L. This shaft and roll may be adjusted up and down toward the carriage C, as occasion may require, by turning the screw Faccordingly, substantially as the crosshead of a planer is raised or lowered to present the tool nearer to or farther from its carriage. The shaft and its roll may be adjusted to any desirable angle across the carriage by loosening the nuts on the bolts 25, and then turning the set-screws f accordingly one of the, boxes will be raised and the other lowered; but in such raising'and lowering the boxes themselves must also turn with the shaft to the same angle. This is permitted by the segment-shaped slots in the boxes, throughwhich the bolts t pass. At the rear similar uprights, M,'are arranged, carrying a pulley, N, corresponding to the pulley L, and in bearings of the same description, adjustable in like manner as the bearings of the pulley L. Around these pulleys an endless band, P, is placed, and to the pulley N power is imparted by means of a band, as indicated, or otherwise, to give a rapid revolution to that pulley, and which revolution is communicated to the band 1? and the forward pulley, L, over which it runs. The surface of the bandL is coated with vulcanite, or any suitable composition which will present the proper grinding-surface. The pulley N is considerably higher than the forward pulley, L.

The article the surface of which is to be ground is secured to the carriage O and the pulley L adjusted to the proper position, so

that the surface of the band will operateupon the surface to be ground. Then the carriage is passed beneath the grinding-surface by mechanism which moves the platen and gradually presents the surface of the article to be ground to the grinding-band. The band hugs close to the surface of the pulley, and is presented to the metal to be ground precisely as if it were a grinding-wheel of the diameter of the pulley L, plus the thickness of the band; but the extent of griding-s'urface is equal to the whole length of the band, which may be much greater than could practically be the surface of a wheel. If the surface to be ground is inclined or at an angle to the carriage, then the pulleys L N are adjusted to the proper inclination to present the grinding-surface of the band accordingly, the adjustment up and down being made by the screw F for the pulley L and the screw R for the pulley N. If the angular position is required, then the setscrews f are adjusted accordingly.

To give to the article being ground a movement upon the grinding-surface, as in handgrinding, I give to the carriage C an automatic transverse movement during its passage beneath the grindingsurface. This I do by means of a longitudinal shaft, S, arranged in the bed of the machine, upon which an arm, T, is arranged, free for longitudinal movement, but splined to the shaft, as shown in Figs. 1 and 2, so as to rock with it. A rocking movement is given to this shaft by means of a crank-wheel, 71 at one end of the machine. From the crank a rod, 2', connects with a long arm, Z, on the shaft S, as seen in Fig. 3. The arm T works through a transverse slot, 11., in the platen, and down through which an arm, 10, attached to the carriage, extends. This arm 20 carries a stud, g, which engages a slot in the arm T, as seen in Figs. 1 and 3, so that the rocking movement imparted to the shaft S by means of the crank-wheel h is transmitted to the carriage O. The crank-wheel is caused to revolve by a worm, w, on the driving-shaft working into a corresponding worm-gear, r, on the shaft of the crank-wheel h. By this combined constantly-forward movement and transverse-reciprocating movement the article .is presented to the grinding-surface substantially as it is when the work is done by hand, .and whereby scratches or lines on the. surface ground are avoided.

The cost of coating bands is much less than the cost of driving wheels which would present the same extent of grinding-surface. The surface of the band is presented to the work as if it were the surface of the pulley, and at the point of grinding is as unyielding as the pulley itself. The pulley which presents the grinding-surface may be very small, enabling the operator to closely examine the work as it is being done without any of the disadvantages attending the use of a large grindingwheel, and a greater rapidity'of movement of the grinding-surface may be attained than can be done by a grinding-wheel, presenting a fractional part of the surface of the band.

I claim- 1. The combination of a longitudinally movable carriage arranged to receive and present the article to be ground, a pulley arranged above said carriage and adjustable with relation to the said carriage, .and an endless band passing from a second pulley around the said pulley over the carriage, the surface of said band coated with a grinding material, substantially as described.

2. The combination of a longitudinally-moving carriage arranged to hold and present the article to be ground, a pulley above said carriage, made adjustable to different angles with relation to the carriage, a second pulley from which the band presenting the grinding-surface passes over said pulley above the carriage, substantially as described.

3. The combination of a longitudinal movable platen, a carriage arranged upon transwill operate upon the article presented to itv by said carriage, substantially as described.

WILLIAM B. FENN.

Witnesses:

HENRY. B. BEACH, SoLoN R. RUsr. 

